USB: iowarrior: fix misuse of return value of copy_to_user()

copy_to_user() returns number of not copied bytes, not error code.

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 2de49c8887c5f772b0f166cc7b98354f4ad902ea..bc88c79875a146712cae5fcb7461325501f20ad7 100644 (file)
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -542,7 +542,7 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd,
                        retval = io_res;
                else {
                        io_res = copy_to_user(user_buffer, buffer, dev->report_size);
-                       if (io_res < 0)
+                       if (io_res)
                                retval = -EFAULT;
                }
                break;
@@ -574,7 +574,7 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd,
                        }
                        io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
                                         sizeof(struct iowarrior_info));
-                       if (io_res < 0)
+                       if (io_res)
                                retval = -EFAULT;
                        break;
                }